build: ensure prebuild @tsky/lex-cli and @tsky/lexicons

[shuuji3]

When cloning this repository for the first time, @tsky/client's type-checking fails due to a lack of type definitions of @tsky/lexicons. This is because there is no dist/index.d.ts (exported by @tsky/lexicons) in a clean repository.

This PR ensures the existence of those files by running pnpm build when we run pnpm install for the first time.

Initial installation

$ git clone https://github.com/tsky-dev/tsky && cd tsky/
$ pnpm run --filter @tsky/client test:typescript

> @tsky/client@0.0.1 test:typescript /tmp/tsky/packages/client
> tsc --noEmit

src/bsky/feed.ts:4:8 - error TS2307: Cannot find module '@tsky/lexicons' or its corresponding type declarations.

4 } from '@tsky/lexicons';
         ~~~~~~~~~~~~~~~~

src/bsky/index.ts:1:39 - error TS2307: Cannot find module '@tsky/lexicons' or its corresponding type declarations.

1 import type { AppBskyActorDefs } from '@tsky/lexicons';
                                        ~~~~~~~~~~~~~~~~

src/tsky/client.ts:7:42 - error TS2307: Cannot find module '@tsky/lexicons' or its corresponding type declarations.

7 import type { Procedures, Queries } from '@tsky/lexicons';
                                           ~~~~~~~~~~~~~~~~

src/tsky/tsky.ts:3:30 - error TS2307: Cannot find module '@tsky/lexicons' or its corresponding type declarations.

3 import type { Queries } from '@tsky/lexicons';
                               ~~~~~~~~~~~~~~~~


Found 4 errors in 4 files.

Errors  Files
     1  src/bsky/feed.ts:4
     1  src/bsky/index.ts:1
     1  src/tsky/client.ts:7
     1  src/tsky/tsky.ts:3
/tmp/tsky/packages/client:
 ERR_PNPM_RECURSIVE_RUN_FIRST_FAIL  @tsky/client@0.0.1 test:typescript: `tsc --noEmit`
Exit status 2

After running build script

$ pnpm build

> tsky@0.1.0 build /tmp/tsky
> pnpm run -r build

Scope: 4 of 5 workspace projects
docs build$ vitepress build
│   vitepress v1.5.0
│ - building client + server bundles...
│ ✓ building client + server bundles...
│ - rendering pages...
│ ✓ rendering pages...
│ build complete in 1.98s.
└─ Done in 2.1s
packages/lex-cli build$ tsc
└─ Done in 1.5s
packages/lexicons build$ tsx ./scripts/generate-types.ts && tsc
│ Getting latest lexicon commit...
│ Downloading lexicons from atproto...
│ Building lex-cli...
│ > @tsky/lex-cli@0.0.1 build /tmp/tsky/packages/lex-cli
│ > tsc
│ Running lex-cli to generate types...
│ Done! Types generated at /tmp/tsky/packages/lexicons/src/lib/lexicons.ts
└─ Done in 3.7s
packages/client build$ pkgroll
└─ Done in 639ms

$ pnpm run --filter @tsky/client test:typescript

> @tsky/client@0.0.1 test:typescript /tmp/tsky/packages/client
> tsc --noEmit

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